Step 1 sounds a lot like what is commonly called "mindfulness" or "awareness".

Steps 2 and 3 sound like "problem-solving".

So it seems to me that "concreteness training" has a lot in common with mindfulness meditation combined with problem-solving, (or short-term action and activity planning.)

But I see a potential problem in asking too much about "How did this come about?" because that question is more abstract and past-focused, and might lead someone into dark thoughts speculating about "why". "How can this be avoided?" seems like safer ground.

I wonder how "concreteness training" as a treatment for depression compares with other activities such as "positive thinking" or meditating on gratitude ("counting your blessings"), and walking and exercising outdoors?

Maybe a combination approach would be more likely to work for a given individual.